Use separate message when all changes are already saved

src/PixiEditor/Data/Localization/Languages/en.json

@@ -599,6 +599,7 @@
   "AUTOSAVE_PLEASE_RESAVE": "Error while saving. Save file manually to enable autosaving.",
   "AUTOSAVE_FAILED_RETRYING": "Error while saving. Retrying in {0} {1}.",
   "AUTOSAVE_DISABLED": "Autosaving paused for document.",
+  "AUTOSAVE_NOTHING_CHANGED": "Nothing changed, not saving.",
   
   "AUTOSAVE_TOGGLE": "Toggle autosave",
   "AUTOSAVE_TOGGLE_DESCRIPTION": "Toggle autosave for document",

src/PixiEditor/ViewModels/SubViewModels/Document/AutosaveDocumentViewModel.cs

@@ -173,7 +173,7 @@ internal class AutosaveDocumentViewModel : NotifyableObject
         {
             updateTextTimer.Stop();
             RestartTimers();
-            UpdateMainMenuTextSave("AUTOSAVE_SAVED", SaveIcon, SuccessBrush, false);
+            UpdateMainMenuTextSave("AUTOSAVE_NOTHING_CHANGED", SaveIcon, InactiveBrush, false);
             return;
         }